The gauge position is controlled by the computer. If the computer detects the temperature is operating below where it should it will fault and drop the gauge to low.... so I read somewhere on this site so it must be true.
My first thought was t-stat or sender, but couldn't remember which caused which symptom. You can test for a stuck open t-stat by feeling the upper radiator hose as the engine warms up. It should stay cool to the touch until it reaches operating temperature, then hot once the t-stat opens.
posted by 99.115.151...
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